Business book



Aug. 31, 1926.

1,597,749 w. WOLF BUSINESS BOOK Filed Dec. 5,1924

Izverziar. WIT/y h/d/ BY. BTT'SRNEY.

Patented Aug". Ell,

U bl l T STATES VIILLY WOLF, OF BERLIN; GERMANY.

BUSINESS BOOK.

Application filed December 5, 1924, Serial No. 754,036, and in GermanyDecember 15, 1923.

This invention relates to covers for ledgers or business books of largesize, especially of so-called permanent loose leaf ledgers, wherebypunched leaves may be filed upon a proper mechanism. Such ledgers haveheretofore ordinarily been made from pasteboard and have been providedwith an outer covering of cloth, for instance velvet, and with a leathercovering at the corners. The filing mechanism of the ledger is almostindestructible, while the bookcovers are subjected to heavy wear andespecially exposed to destruction at the corners and edges, so that thebook-covers must comparatively often be renewed.

Book covers have also been used which, instead of the usually employedcloth coverings are provided with a covering of vulcanized fiber. Inthis case, however, only extremely thin fiber. plates are used which areunited by glue with the thicker pasteboard and fastened to the latter byrivets and have sharply cut edges. At the edges the book-covers will beeasily damaged, because the fibrous plates are exposed with their crosssection at the edges to rough handling and accordingly will be easilyreduced to fibers at these places.

This invention has for its object to provide a ledger or book, whichemploys heavy fiber plates so disposed that a reducing to fibers at theedges will be avoided by providing resistance against wear duringhandling which will render the book-cover as indestructible as themechanism serving for the filing of the leaves. By this invention at thesame time the advantage will be secured that the manufacture of thebookcovers, in spite of their greater durability, will be quiteessentially simplified and cheapened, so that besides the technicalsuccess also a commercial advantage is obtained which is of the greatestimportance for practical purposes.

In the drawing accompanying and forming part of this specification,

Fig. l is a side or edge view of a pair of book covers made in'accordance with the present invention, showing the same attached to a backmember;

Fig. 2 is a plan view thereof;

Fig. 3 is a transverse sectional view, on a smaller scale, illustratingthe manner in which the covers are formed. and the mold for formingthem; and

Fig. 4 is a perspective view of a cover blank showing the same with itsedges bent over in accordance with the present inventlon.

Referring to the drawing, each of the covers is formed. of a fiber platea, three of the edges of which are bent upon themselves to provide foldsor rebates a a and a for the reception of a suitable stiffening orreinforcing plate of cardboard, wood or other suitable material ashereinafter described.

Believing that the cover can best be described by describing the methodof forming it, I have shown in Fig. 3 a suitable mold or form plate 0.This mold maybe simply a plate having a central longitudinal depressioninto which the fiber plate a, after having a predetermined margin aroundthree of its edges wet to soften the same. is

forced under suitable pressure, the fiber plate being of greater lengthand width than said depression, whereby when pressed into the latter thetwo longitudinal side edges and one end edge will be turned upward toform a boxlike structure having a bottom and three upstanding walls, theheight of said walls being greater than the depth of the depression sothat said walls will project above the thicker side portions of themold. A plate 5 is then placed within the boxlike structure, said platebeing of such width and length as to fit snugly within said structure.The mold is provided with three plates d of greater width than thethicker portion ofthe mold, and after the insertion of the plate 6,theplates d are slid on the top surface of the mold toward the center soas to bend over the upwardly projecting edges of the boxlike structureand cause them to lie in contact with the plate I). This plate 2) may bethe reinforcing or stiffening plate hereinbefore referred to which isleft permanently in the cover, or it may be a special plate formed ofmetal or other suitable material and removable to give place to saidpermanent reinforcing plate.

After the reinforcing plate has been inserted into position with itsedges within the folded over edges of the plate a as above described,the space above the reinforcing plate between the opposite turned-overedges of the folds may be filled in with a suitable fillet 6, thereby tobring the entire side of the cover into a single plane. The filletedescribed may be connected by hinges g With a back f, said back being ofWellknown construction and provided With the usual loosea leafmechanism, the hinges being preferably inserted hetweenthe fiber plate aand the reinforcing plate 7). i i

The fact that; the edges of the fiber plates are folded over resultsfinthe formation of;

beak covers Ha ing r lat vely th ck rou ded edges capable ofconsiderable resistance to strains to'vvhich they may be subjected in heha d g of the .01;

1 Having thus described my invention, what I claim is:"

A bodk cover, comprising a fiber plate folded over at three of its edgesto form rehates, a reinforcing plate secured at its edges in saidrebates, and a fillet overlying saidreinforcing platebetvveen foldedover edges whereby the surface of the cover wi lalie. n a i g pla e-e aIn testimony whereof I afiix my, signature.

WILLY WOLF;

